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介绍了一种工作在准连续状态下的直接液体冷却的侧面抽运Nd:YAG多薄片激光谐振腔,装置中选用20片Nd:YAG薄片作为增益介质,由激光二极管阵列在其侧面进行抽运,流动的硅氧烷溶液作为冷却液在其端面进行冷却,振荡激光以布儒斯特角穿过多层薄片和冷却液实现增益。设计了层流冷却流场并通过数值模拟验证了其对来流不均匀性的耗散能力。根据之前报道的层流冷却能力测量实验建立数值模型,模拟了流场的冷却效果,实验结果证明了模型的置信性,进而基于模型对激光器中薄片的热安全性进行了评估。在抽运能量为49.9J时,获得了15.7J的最大脉冲能量输出,对应光-光效率和斜率效率分别为31.4%和39.2%;在抽运脉宽为250μs,重复频率为100Hz,平均抽运功率为5kW时,获得了1440 W的平均输出功率。
A side-pumped Nd: YAG multilayered laser resonator with direct liquid cooling under quasi-continuous operation was introduced. Twenty pieces of Nd: YAG thin films were chosen as the gain medium in the device, and pumped by the laser diode array on the side , The flowing siloxane solution is cooled on its end face as a cooling fluid and the laser oscillates at Brewster’s angle across the multilayered sheet and coolant to achieve gain. The laminar cooling flow field is designed and its dissipation of inhomogeneous flow is verified by numerical simulation. According to the previously reported laminar cooling capacity measurement experiment, a numerical model was established to simulate the cooling effect of the flow field. The experimental results proved the confidence of the model and the thermal safety of the lamella in the laser was evaluated based on the model. At the pumping energy of 49.9J, the maximum pulse energy output of 15.7J was obtained, corresponding to the light-optical efficiency and slope efficiency of 31.4% and 39.2% respectively. At the pumping pulse width of 250μs and the repetition frequency of 100Hz, When the power is 5kW, the average output power of 1440W is obtained.